/usr/share/emacs/site-lisp/proofgeneral/isa/ is in proofgeneral-misc 3.7-4.
This file is owned by root:root, with mode 0o755.
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/usr/share/emacs/site-lisp/proofgeneral/isa/README.isa
/usr/share/emacs/site-lisp/proofgeneral/isar/BUGS.isar
/usr/share/emacs/site-lisp/proofgeneral/isar/Example-Xsym.thy
/usr/share/emacs/site-lisp/proofgeneral/isar/Example.thy
/usr/share/emacs/site-lisp/proofgeneral/isar/KnasterTarski.thy
/usr/share/emacs/site-lisp/proofgeneral/isar/README.isar
/usr/share/emacs/site-lisp/proofgeneral/isar/Root2_Isar.thy
/usr/share/emacs/site-lisp/proofgeneral/isar/Root2_Tactic.thy
/usr/share/emacs/site-lisp/proofgeneral/isar/Tarski.thy
/usr/share/emacs/site-lisp/proofgeneral/isar/interface
/usr/share/emacs/site-lisp/proofgeneral/isar/interface-setup.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isabelle-system.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar-autotest.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar-find-theorems.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar-keywords.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar-mmm.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar-syntax.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar-unicode-tokens.el
/usr/share/emacs/site-lisp/proofgeneral/isar/isar.el
/usr/share/emacs/site-lisp/proofgeneral/isar/x-symbol-isar.el